Turbidimetry by image degradation analysis

Here, we describe a method to measure turbidity in liquids by probing a graphic pattern by optical transmission. Data are collected by a video camera, and a mathematical algorithm is used to correlate image loss with turbidity. We report high-resolution turbidity measurements of nanoparticle colloids to assess the proposed methodology. Measurements are differentially performed, which helps reduce noise from external sources. Using nephelometric turbidity units (NTU) standards, we obtain detectable measurements in a broad range of NTU from 1.95 to 1000. By implementing the proposed methodology, we proposed a video-based inexpensive yet reliable turbidimetry instrument.